"Michigan, Deaths, 1867-1897," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/N3VJ-ZHQ : accessed 10 February 2015), Mertje Tjietzema, 23 May 1891; citing p 81 rn 224, Olive, Ottawa, Michigan, Department of Vital Records, Lansing; FHL microfilm 2,363,829.